Automatic safety check-valve.



J. G. ONEILL & J. S. DYE.

AUTOMATIC SAFETY CHECK VALVE.

APPLICATION FILED MAY 11, 1910.

Patented NOV. 8, 1910.

J ASINENTORS d n e Jaggefi/fi C. 0%76 rmwjim ATTORN EY UNrrn STTS JOSEPH C. ONEILL AND JOHN S.

DYE, 0F TRENTON, NEW JERSEY.

AUTOMATIC SAFETY CHECK-VALVE.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed May 11, 1910. Serial No. 560,612.

To all whom it may concern:

Be it known that we, J OSEPH C. ONEILL and JOHN S. DYE, citizens of the United States, residing at Trenton, in the county of Mercer and State of New Jersey, have in vented a certain new and useful Improvement in Automatic Safety Check-Valves, of which the following is a specification.

Our invention relates to a new and useful improvement in safety check valves, and has for its object to provide an exceedingly simple and efiective device of this character, which will eliminate the danger of boiler explosions, caused by the water becoming low or at a dangerous level.

The objects of the invention are obtained by constructing a check valve which will prevent water entering the boiler after the water in said boiler has reached a dangerous level or has been entirely exhausted.

Another object of the invention is to provide a check valve of the character described with means for preventing back pressure from the boiler.

With these ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, we will describe its construction in detail, referring by letter to the accompanying drawing forming a part of this specification, in which- Figure 1 is a vertical sectional view of a safety check valve made in accordance with our improvement, and Fig. 2, a section at the line w:r of Fig. 1.

In carrying out our invention as here embodied, A represents a casing, having an inlet B from the water supply, and out-let C to the boiler and an opening D whereby the interior of the casing may be reached without uncoupling the water system.

With the interior of the casing is formed an integral spout E by the lid F dependingly mounted upon the arm G, said arm being swingingly mounted upon the bolt H which passes through the walls of the casing, having a nut I mounted thereon to hold it in place. 1

J is a guide having a flange K formed with its upper end, said flange adapted to rest upon the outer end of the walls, formi ing the opening D when said guide has been inserted in said opening D. This guide has an aperture L forined in one side thereof and this aperture is placed opposite the lid l dto allow for the free movements of said At the lower end of the guide J is formed a seat M for the reception of the float valve N. The guide J fits snugly within the opening D and its lower end rests against an extension or partition 0 whereby the water passing through the casing'from the water supply to the boiler must pass through the opening L and downward through the guide J.

P denotes a cap threaded upon the casing over the opening D, thereby holding the guide J in place and preventing the passage of water through the opening D.

The operation of the device is as follows :The cap P is removed and the water allowed to flow to the boiler, the float valve N is then placed in the guide which will cause it to flow in said guide in proximity to its upper end, and the force of the water holding the lid F upward, a portion thereof will extend into the guide, so that the float valve N cannot reach the seat M. Should the water for any reason cease to flow to the boiler, the lid F will close by gravity and prevent back pressure. As the water is used from the boiler the float valve N will gradually descend until it takes its seat M, and when in this position should the water be turned on it will enter the guide above the valve, and the pressure of said water will hold said float valve upon its seat, preventing its passage to the boiler. The lid F at this time will be above the float valve N and will further prevent the rise of the float. After the boiler has been cooled down, the cap P may be removed and the float valve N again placed in the water after it has been again turned on.

From this description it will be seen that a check valve constructed in accordance with our improvement will prevent the flow of water to the boiler after the water in said boiler has reached a dangerous level, in this way overcoming the possibility of exploslons.

Of course we do not wish to be limited to the exact details of construction here shown, as these may be varied within the limits of the appended claims without departing from the spirit of our invention.

Having thus fully described our invention, What we claim as new and useful, is

1. In a check valve, a casing having an inlet, an outlet and an opening, an internal spout formed integral with the Walls of the casing relatively near the inlet, a guide provided with an aperture and valve seat mounted in the opening, a float valve placed in said guide, a lid, and a swinging arm on the free end of which is mounted said lid, said lid adapted to close the spout for preventing back pressure and for holding the float valve up or down, depending upon the position of said float valve.

2. In a check valve, a casing having an inlet, an outlet and an opening, an internal spout formed integral with the walls of the casing relatively near the inlet, a guide provided with an aperture and valve seat mounted in the opening, a float valve placed in said guide, a bolt passing through the walls of the casing, an arm swingingly mounted thereon, a lid mounted upon the free end of said arm for closing the spout for holding the float valve up or down, depending upon the position of said float valve, and a cap threaded over the opening to hold the guide other time below the line of the liquid flow.

i. In a check valve, a casing having an lnlet and an outlet, a gulde havlng a valve seat and an aperture at right angles to one another mounted in the casing, a float valve contained in said guide, said valve being at one time above and atanother time below the aperture, and means for preventing the passage of the valve from one position to the other while the liquid remains under pressure in the casing.

In testimony whereof, we have hereunto affixed our signatures in the presence of two subscribing witnesses.

JOSEPH C. ONEILL. JOHN S. DYE.

Witnesses:

THOS. QUIRK, H. C. BITNER.

[L. s] [1,. s] 

